Panorama Exposure Control via Luminosity Histogram Segmentation
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Solution Overview
Problem
Existing image capture technologies face challenges in creating consistent exposure across panorama images, often resulting in too-dark or too-bright areas due to varying luminance, leading to poor image quality.
Innovation Solution
An image pickup device and method that captures temporary images, synthesizes them into panorama images, splits these into zone-areas based on luminosity histograms, and adjusts exposure values using a lookup table to calculate a weighting-exposure value, ensuring balanced exposure across the image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a high luminance is used for shooting the scene at the beginning, then the luminance of the image is sufficient, but the darker area of the image becomes too dark due to insufficient exposure
Solution Approach 1:
The panorama image is divided into multiple zone-areas based on luminance distribution, allowing different exposure compensation to be applied to different regions. This segmentation enables the system to handle varying luminance conditions across different parts of the image independently, resolving the contradiction between overall luminance sufficiency and local exposure consistency.
Solution Approach 2:
Different exposure values are assigned to different zone-areas based on their specific luminance characteristics. The processing module calculates a weighting-exposure value for each zone-area and applies targeted exposure compensation, ensuring that each region receives appropriate exposure treatment rather than applying a uniform exposure setting across the entire image.
2Duration of action of moving object
If a too-low luminance is used to shoot a scene, then the exposure time can be longer, but a brighter area may become too bright or turn into a whitening condition due to over-exposure
Solution Approach 1:
The image is segmented into zone-areas with different luminance characteristics, allowing the system to apply different exposure controls to different regions. This prevents over-exposure in bright areas while maintaining sufficient exposure time for darker regions, resolving the contradiction between exposure duration and exposure control precision.
Solution Approach 2:
The system dynamically adjusts exposure parameters (exposure value, aperture, shutter speed) based on the luminance characteristics of different zone-areas. By changing these parameters adaptively rather than using fixed settings, the system can prevent over-exposure in bright areas while maintaining adequate exposure time for darker regions.
3Area of stationary object
If the average exposure value of each image is different in panorama shooting, then the panorama image can capture the whole scene, but the whole image of each image is inconsistent and the panorama image has obvious inconsistent luminance
Solution Approach 1:
The panorama image is divided into multiple zone-areas based on luminance histogram analysis, allowing the system to apply targeted exposure compensation to each zone. This segmentation approach maintains the comprehensive scene coverage while ensuring luminance consistency across different regions by addressing each zone's specific exposure requirements.
Solution Approach 2:
The system uses luminance histogram analysis to detect luminance distribution characteristics and feeds this information back to adjust exposure parameters. The processing module calculates weighting-exposure values based on the luminance distribution and applies appropriate compensation, creating a feedback loop that ensures luminance consistency across the entire panorama image.
Data Source
AI summary
This invention discloses an image pickup device and an image synthesis method thereof The image pickup device comprises an image-pickup module, an image-synthesis module, a database and a processing module. The image-pickup module captures a plurality of temporary images of a scene. The image-synthesis module extracts a part of each temporary image and combines the parts to form a panorama temporary image, and splits the panorama temporary image into a plurality of zone-areas according to at least one threshold value and a panorama luminosity histogram. The database stores a lookup table for recording a plurality of exposure values. The plurality of the exposure values correspond to luminance values of the zone-areas respectively. The processing module obtains the plurality of exposure values corresponding to the luminance values and obtains a weighting-exposure value by an equation, and controls the image-pickup module to capture the panorama image according to the weighting-exposure value.